I had a Asus fanless 5450 and used the auto tune feature to get the highest clocks possible with it. I have been enjoying Borderlands 2 lately. I got the 6450 as it is the only faster low profile flat fanless card I could find to try and get a few more fps. The 6450 after install does not show the auto tune option in the "AMD OverDrive" section.

I have tried latest beta driver etc. but for some reason the auto tune feature in the overclock section of the Catalyst drivers is gone. Both the 5450 and 6450 are Asus cards brand new.